Optional
value can hold either a value or not. The value held in the Optional
can be accessed using the
get()
method, but it will throw a
NoSuchElementException
if there is no value present. To avoid the exception, calling the isPresent()
method should always
be done before any call to get()
.
Alternatively, note that other methods such as orElse(...)
, orElseGet(...)
or orElseThrow(...)
can be used
to specify what to do with an empty Optional
.
Optional<String> value = this.getOptionalValue(); // ... String stringValue = value.get(); // Noncompliant
Optional<String> value = this.getOptionalValue(); // ... if (value.isPresent()) { String stringValue = value.get(); }
or
Optional<String> value = this.getOptionalValue(); // ... String stringValue = value.orElse("default");